"I really want it to become something that non-disabled people can not ignore."
Some disabled workers are being paid pennies per hour under a 78-year-old loophole in federal wage law.
The Republican candidate drew criticism for apparently making fun of a reporter's joint condition.
Launched in Turkey, the app is expected to be used by 800,000 people by 2016.
The chain apologized and issued a partial paycheck while it investigates further.